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3 recent "Did you know?":

... that Chiara Daraio used Newton's cradle to create sound bullets, and ball bearing filled walls to create one-way sound barriers? en.wikipedia.org/wiki/Chiara_D

... that a tetrahedron with integer edge lengths, face areas, and volume can be given integer coordinates?
en.wikipedia.org/wiki/Heronian

... that former college basketball star Amy Langville is an expert in ranking systems, and has applied her ranking expertise to basketball bracketology?
en.wikipedia.org/wiki/Amy_Lang

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